F.eks har tysk høyesterett utfordret dette prinsippet en rekke ganger fra 1974 frem til den siste avgjørelsen i mai 2020:
Videre er det verdt å merke seg:"The version of supremacy articulated by the ECJ has been questioned by the German Constitutional Court in a series of cases that stretch back to 1974. The May 2020 ruling, in which the court attacked the ECB’s quantitative easing program, may have been the first time the court bit, but it has been barking that EU law cannot overrule the German constitution for almost as long as the ECJ has been insisting that it can."
Det er påfallende hvor mye sterkere Brüssel reagerer denne gangen..."Moreover, when the EU’s member countries had an opportunity to explicitly recognize EU law’s primacy over national law, they didn’t take it. The ill-fated Treaty Establishing a Constitution for Europe included an article enshrining EU legal supremacy. That provision, among others, was dropped from its successor, the Lisbon Treaty, after the EU’s constitution-making project proved a bridge too far for European citizens."